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45 results on '"Hloch, Sergej"'

1. Optimisation of Abrasive Waterjet Milling Technique for Pocket Milling Operations

Author

Nag, Akash, Klichová, Dagmar, Hlaváček, Petr, Petrů, Jana, Hloch, Sergej, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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2. The Effect of Multiple Impacts of Water Droplets on the Integrity of CFRP Composite

Author

Chlupová, Alice, Poloprudský, Jakub, Nag, Akash, Hloch, Sergej, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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3. Influence of Erosion Time on HVOF-Sprayed Cermet Coating: Preliminary Study

Author

Poloprudský, Jakub, Vražina, Tomáš, Nag, Akash, Stolárik, Gabriel, Chlupová, Alice, Zábranský, Karel, Gejdoš, Pavel, Čelko, Ladislav, Hloch, Sergej, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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23. COMPARISON OF THE EFFECTS OF STANDARD NOZZLES AND EXTENSION TUBES ON THE EROSION OF PMMA USING PULSATING WATER JET TECHNOLOGY.

Author

Nag, Akash, Stolarik, Gabriel, and Hloch, Sergej

Subjects
JET nozzles, ARTHROPLASTY, BONE cements, TRAUMA surgery, MUSCULOSKELETAL system injuries
Abstract

The study of bone cement disintegration is important for advancing orthopedic and trauma surgery outcomes. Bone cement, commonly used in joint replacement procedures, plays a vital role in fixation implants. However, the long-term stability and integrity of bone cement are critical for the success of these procedures. This study focuses on the use of ultrasonic pulsating water jet technology for the selective removal of bone cement, aiming to provide a precise and efficient method for revision surgeries. The disintegration efficiency is measured in terms of depth, width and volume of the disintegrated bone cement as a result of variations in the nozzle geometry, supply pressure and traverse speed. Two different nozzle types, the standard nozzle insert and nozzle with an extension tube of 100 mm having a diameter of 0.3 mm, are used. Two supply pressure levels were taken as 10 and 20 MPa with five levels of traverse speeds as 0.5, 1, 1.5, 2 and 2.5 mm/s. The results showed an increased disintegration efficiency for all experimental conditions using an extension tube nozzle as compared to a standard nozzle (20 - 25% in terms of disintegration volume). Also, the disintegration efficiency increased with higher pressure level values (8.2 mm3 and 4.85 mm3 for p = 20 and 10 MPa, respectively) and lower traverse speed values. The results showed a promising direction in terms of the utilization of an ultrasonic pulsating jet with a modified nozzle type for higher bone cement disintegration efficiency. [ABSTRACT FROM AUTHOR]

Published
2024
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24. MAXIMIZATION OF WEAR RATES THROUGH EFFECTIVE CONFIGURATION OF STANDOFF DISTANCE AND HYDRAULIC PARAMETERS IN ULTRASONIC PULSATING WATERJET.

Author

Nag, Akash, Dixit, Amit Rai, Petrů, Jana, Váňová, Petra, Konečná, Kateřina, and Hloch, Sergej

Subjects
DETERIORATION of materials, MECHANICAL wear, SURFACE topography, ALUMINUM alloys, CROSS-sectional imaging, WATER jets
Abstract

A pulsating waterjet is a technological modification of a conventional waterjet that utilizes ultrasonic vibrations to generate a modulated jet, resulting in repetitive fatigue loading of the material. The erosion efficiency of the ultrasonic pulsating waterjet is majorly determined by the hydraulic factors and its interaction with standoff distance. However, the dependency of the wear rates on different hydraulic factors and formulation of an implicit prediction model for determining effective standoff distance is still not present to date. Therefore, in this study, the combined dependency of the supply pressure (20-40 MPa), nozzle diameter (0.3-1.0 mm), and standoff distance (1-121 mm) on wear rates of AW-6060 aluminum alloy are studied. Statistical analysis is used to determine the statistically significant factors and formulate regression equations to determine output responses within the experimental domain. The surface topography and sub-surface microhardness of the eroded grooves were studied. The results show that both the disintegration depth and the material removal increase with an increase in the nozzle diameter and supply pressure. However, the dependency of the output responses on nozzle diameter is statistically more evident than supply pressure and two-way interactions. Cross-sectional images of the grooves showed typical hydrodynamic erosion characteristics in erosion cavities, subsurface voids, and material upheaving. The results of microhardness analysis showed an approximately 15-20% increase in hardness values compared to the untreated samples. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Microwave-Assisted Synthesis, Characterization and Tribological Properties of a g-C 3 N 4 /MoS 2 Nanocomposite for Low Friction Coatings.

Author

Saxena, Mukul, Sharma, Anuj Kumar, Srivastava, Ashish Kumar, Singh, Rabesh Kumar, Dixit, Amit Rai, Nag, Akash, and Hloch, Sergej

Subjects
MOLYBDENUM nitrides, NANOCOMPOSITE materials, TRANSITION metals, FRICTION, TRIBOLOGY, NITRIDES, MOLYBDENUM sulfides
Abstract

This study explores the tribological performance of microwave-assisted synthesized g-C3N4/MoS2 coatings. The two-dimensional transition metal dichalcogenide (TMD) nanosheet is getting prominence in the study of tribology due to its layered structure. The graphitic carbon nitride (g-C3N4) nanosheet was made using the calcination method and its nanocomposite with molybdenum disulfide (MoS2) was produced using a microwave-assisted method. The structure and morphology of the samples were characterized by some well-known methods, and tribological properties were studied by a pin-on-disc (POD) apparatus. Morphological analysis revealed that graphitic carbon nitride and molybdenum disulfide coexisted, and the layer structured MoS2 was well dispersed on graphitic carbon nitride nanosheets. BET analysis was used to determine the pore volume and specific surface area of the synthesized materials. The inclusion of MoS2 nanoparticles caused the composite's pore volume and specific surface area to decrease. The reduction in g-C3N4 pore volume and specific surface area confirmed that the pores of calcinated graphitic carbon nitride were filled with MoS2 nanoparticles. The tribological property of g-C3N4/MoS2 nanocomposite was systematically investigated under different factors such as applied loads (5N to 15N), sliding speed (500 to 1000 mm/s) and material composition (uncoated, MoS2-coated, 9 wt.% of g-C3N4 and 20 wt.% of g-C3N4 in the composite). The optimal composite material ratio was taken 9%, by weight of g-C3N4 in the g-C3N4/MoS2 composite for a variety of levels of loads and sliding speeds. The results indicates that the incorporation of g-C3N4 in nanocomposites could reduce friction and improve wear life, which were better than the results with single MoS2. This study demonstrates a solution to broaden the possible uses of g-C3N4 and MoS2-based materials in the field of tribology. [ABSTRACT FROM AUTHOR]

Published
2022
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30. Measurement of Impact Pressure of the Water Jet

Author

Foldyna, Josef, Zeleňák, Michal, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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31. Topaz as a Potential Abrasive for Cutting and Surface Treatment of Materials by AWJ Technology

Author

Martinec, Petr, Sitek, Libor, Veselovský, František, Hlaváček, Petr, Foldyna, Josef, Klomínský, Josef, Gabor, Roman, Němcová, Lucie, Ruppenthalová, Lucie, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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32. Study of Erosion Wear of PVD-Coated Focusing Tubes in AWJ Cutting Process

Author

Hlaváček, Petr, Sitek, Libor, Zeleňák, Michal, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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33. Numerical and Experimental Study of Oscillating Water Jets Injected in Submerged Conditions

Author

Miranda, Fernando Kevin, Zeleňák, Michal, Říha, Zdeněk, Nag, Akash, Souček, Kamil, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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34. Observation and Theory to Improve the Efficiency of Jet Grouting

Author

Modoni, Giuseppe, Wanik, Lidia, Bzówka, Joanna, Salvatore, Erminio, Arciero, Michela, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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35. Investigations on the Influence of Small Impact Angles for Abrasive Water Injector Jet Cutting of High-Performance Workpieces

Author

Reder, Waldemar, Uhlmann, Eckart, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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36. Influence of Phase Composition in an Injection-Type Abrasive Slurry Jet (iASJ)

Author

Schüler, Manuel, Lindken, Ralph, Görres, Brendan, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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37. Relation of the AWJ Machine Construction and the Amplitude of Vibrations Measured on the Sample

Author

Gřunděl, Jakub, Hlaváč, Libor M., Pětroš, Petr, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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38. Use of Accelerated-Hydro-Abrasive-Cavitation-Erosion (AHACE) Method to Investigate the Erosion Resistance of Rocks to Fast Flowing Liquids

Author

Sitek, Libor, Hlaváček, Petr, Martinec, Petr, Bodnárová, Lenka, Klichová, Dagmar, Foldyna, Josef, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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39. Influence of Liquid Viscosity on the Origin and Propagation of Self-Excited Oscillations

Author

Zeleňák, Michal, Foldyna, Vladimír, Říha, Zdeněk, Miranda, Fernando Kevin, Nag, Akash, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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40. Practical and Theoretical Study of Abrasive Particle Velocities Observation in the High-Speed Water Jet Using Optical PTV–LIF Method and CFD Numerical Computation

Author

Zeleňák, Michal, Říha, Zdeněk, Souček, Kamil, Miranda, Fernando Kevin, Foldyna, Vladimír, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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41. Preliminary Investigation of the Cutting Edge Preparation of Carbide Tools Using the Abrasive Water Injection Jet Technology

Author

Redžić, Nermin, Morczinek, Florian, Winter, Sven, Regel, Joachim, Dix, Martin, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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42. Influence of Abrasive Water Jet Cutting Parameters on the Surface Properties of Modern Plain Bearing Materials

Author

Praźmo, Jarosław, Kawecka, Elżbieta, Forysiewicz, Monika, Radomska-Zalas, Aleksandra, Perec, Andrzej, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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43. Experimental Characterisation of the Secondary Jet in Abrasive Water Jet Machining on the Example of an Oxide Ceramic

Author

Schüler, Manuel, Walotka, Manuel, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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44. Multiple-Criteria Optimization of the Water Jet Cutting Process Using WISP Methodology

Author

Perec, Andrzej, Kawecka, Elżbieta, Radomska-Zalas, Aleksandra, Pude, Frank, Galecki, Greg, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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45. Relation Between Applied Traverse Speed and Quality of Metal Surfaces Created by Abrasive Water Jet Cutting

Author

Pětroš, Petr, Hlaváč, Libor M., Gřunděl, Jakub, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Sitek, Libor, editor, Valentinčič, Joško, editor, Trieb, Franz H., editor, and Hloch, Sergej, editor

Published
2025
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